MapServer is a system for developing web-based GIS applications.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. May 8, 2026 · NIST NVD

   Detected

   MapServer is a system for developing web-based GIS applications. From version 6.0 to before version 8.6.2, a reflected XSS vulnerability in MapServer's WMS server allows an unauthenticated attacker to inject arbitrary HTML/JavaScript into the browser of any user who opens a crafted WMS URL. The vulnerability is triggered via FORMAT=application/openlayers combined with an unsanitized SRS parameter

2. Jun 17, 2026 · NIST NVD

   Updated

   MapServer is a system for developing web-based GIS applications. From version 6.0 to before version 8.6.2, a reflected XSS vulnerability in MapServer's WMS server allows an unauthenticated attacker to inject arbitrary HTML/JavaScript into the browser of any user who opens a crafted WMS URL. The vulnerability is triggered via FORMAT=application/openlayers combined with an unsanitized SRS parameter

Affected

• cpe osgeo/mapserverversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-42030

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-42030

  MapServer is a system for developing web-based GIS applications. From version 6.0 to before version 8.6.2, a reflected XSS vulnerability in MapServer's WMS server allows an unauthenticated attacker to inject arbitrary HTML/JavaScript into the browser of any user who opens a craft

  nvd.nist.gov

References

• Product · github.com
• Exploit · github.com